暴力枚举

#include <iostream>
#include <algorithm>

using namespace std;
int gcd(int a, int b);

int main()
{
    int x, y;
    cin >> x >> y;

    cout <<  gcd(x, y) << endl;
    return 0;
}
int gcd(int a, int b){
    int m = min(a,b);
    for(int i = m; m > 0; i--)
    {
        if(a % i == 0 && b % i == 0)
        {
            return i;
            break;
        }
    }
}